US3147074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfuric acid process
Assignee: Chemical Construction Corp
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Filing: 1961-09-18
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Granted: 1964-09-01
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Expires: 1981-09-18
Abstract
No abstract record available.
Inventors
- 👤 Michael H Maurer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:55
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/69; C01B17/74; C01B17/76; C01B17/765; Y; Y02; Y02P; Y02P20/00; Y02P20/10; Y02P20/129
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
PROCESS FOR PRODUCTION OF SULFURIC ACID WHICH COMPRISES BURNING SULFUR TO SULFUR DIOXIDE WITH A FIRST STREAM OF PRE-DRIED AIR, COOLING THE RESULTING GAS STREAM CONTAINING SULFUR DIOXIDE IN STEAM GENERATION MEANS, HEATING A SECOND STREAM OF PRE-DRIED AIR BY HEAT EXCHANGE IN CATALYTIC CONVERSION MEANS FOR THE OXIDATION OF SULFUR DIOXIDE TO SULFUR TRIOXIDE, COMBINING SAID HEATED SECOND AIR STREAM WITH SAID SULFUR DIOXIDE-CONTAINING GAS STREAM, PASSING THE COMBINED GAS STREAM THROUGH SAID CATALYTIC CONVERSION MEANS, RECOVERING A FINAL GAS STREAM FROM SAID CONVERSION MEANS COMPRISING SULFUR TRIOXIDE, AND ABSORBING SAID SULFUR TRIOXIDE IN CONCENTRATED SULFURIC ACID TO FORM FURTHER SULFURIC ACID IN THE LIQUID PHASE.
Claim 2
Dependent Claim
107 words
PROCESS FOR PRODUCTION OF SULFURIC ACID WHICH COMPRISES BURNING SULFUR TO SULFUR DIOXIDE WITH A FIRST STREAM OF PRE-DRIED AIR, COOLING THE RESULTING GAS STREAM CONTAINING SULFUR DIOXIDE IN STEAM GENERATION MEANS, HEATING A SECOND STREAM OF PRE-DRIED AIR BY HEAT EXCHANGE IN CATALYTIC CONVERSION MEANS FOR THE OXIDATION OF SULFUR DIOXIDE TO SULFUR TRIOXIDE, COMBINING SAID HEATED SECOND AIR STREAM WITH SAID SULFUR DIOXIDE-CONTAINING GAS STREAM, PASSING THE COMBINED GAS STREAM THROUGH SAID CATALYTIC CONVERSION MEANS, RECOVERING A FINAL GAS STREAM FROM SAID CONVERSION MEANS COMPRISING SULFUR TRIOXIDE, AND ABSORBING SAID SULFUR TRIOXIDE IN CONCENTRATED SULFURIC ACID TO FORM FURTHER SULFURIC ACID IN THE LIQUID PHASE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |